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Fair Value Measurements (Fair Value Hierarchy Classification) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term borrowings $ 1,111 $ 1,469
Portion at Other than Fair Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term receivables 580 334
Customer financing notes receivable 288 272
Short-term borrowings 1,111 1,469
Long-term debt (excluding finance leases) 43,988 43,996
Long-term liabilities 498 508
Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term receivables 557 314
Customer financing notes receivable 286 265
Short-term borrowings 1,111 1,469
Long-term debt (excluding finance leases) 45,643 44,003
Long-term liabilities 465 467
Fair Value Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term receivables 0 0
Customer financing notes receivable 0 0
Short-term borrowings 0 0
Long-term debt (excluding finance leases) 0 0
Long-term liabilities 0  
Fair Value Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term receivables 557 314
Customer financing notes receivable 286 265
Short-term borrowings 849 1,258
Long-term debt (excluding finance leases) 45,213 43,620
Long-term liabilities 465 467
Fair Value Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term receivables 0 0
Customer financing notes receivable 0 0
Short-term borrowings 262 211
Long-term debt (excluding finance leases) 430 383
Long-term liabilities 0 0
Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 55 51
Derivative Assets 70 85
Derivative Liabilities (201) (286)
Fair Value, Measurements, Recurring [Member] | Fair Value Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 55 51
Derivative Assets 0 0
Derivative Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 0 0
Derivative Assets 70 85
Derivative Liabilities 201 286
Fair Value, Measurements, Recurring [Member] | Fair Value Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 0 0
Derivative Assets 0 0
Derivative Liabilities $ 0 $ 0